Expand for T12/900M Soldering Iron Functions: Include 2 heating tip adapters specially designed to for 936/T12 soldering iron and turn them into a portable heat insert pressing machine tool to expand their functions,Heating tip with M4 thread!M2-M8 Brass Knurled Nut: Wide range brass knurled nut embedded insertion tip heads include M2,M2.5,M3,M4,M5,M6,M8 to meet your most installation needsEasy to Use: Screw installation design easy to change different head model, no need to take off the soldering iron whole tip,just screw off the tip head then install the model headBetter Performance: Tip head made from brass with high strength and good heat conduction ensure better heat insertion performance to get a smooth and clean insert than the normal soldering iron using3D Printed Parts Essential Tool: Ideal for install brass knurled nut into your 3D printing parts enable you assemble and disassemble your projects easily, but won't ruin or contaminate your part rather than a normal soldering iron tip that either stuck or penatrate the insert holeColor: As ShownMaterial: BrassPackage Contents:1 * T12 Soldering Iron Tips kitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.